BAC Calculator

Widmark formula · updates live

You

Sex

Body weight lbs

Age

Age sets the legal limit that applies to you. Widmark has no age term, so it doesn't change the BAC figure.

Drinks

Beer12 oz · 5%

Wine5 oz · 12%

Shot1.5 oz · 40% · 80 proof

Customyour own pour

oz % ABV

= 0.0 standard drinks · 0.0 g alcohol

Timing

Approx. time of first drink

Approx. time of last drink

Your BAC now 0.0000

Enter your weight and drinks.

Peak BAC: —
Under 0.08: —
Back to 0.0000: —

Estimate only — don't drive on it.

Widmark is a population average, not a measurement of you. Food, medication, drinking pace, health and your own metabolism all move the real number, and actual BAC is frequently higher than this figure. It is not a legal or medical tool, it will not hold up as evidence of anything, and it is no substitute for a breathalyzer or for simply not driving. If you have been drinking, do not drive.